By far one of the biggest pet peeves so far has to be manually sorting and dragging every item in the game.
Understandably there are more important things to spend dev time on and also the small delay between quick-looting items may or may not be a design choice. Regardless, being able to quick stack into chests would solve a whole world of pain, probably be the best QoL improvement atm and make the general experience that little bit smoother 
I know Iām not the only one.
